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Nystagmus is a condition that causes involuntary, rapid movement of one or both eyes. The eye(s) may move from side to side, up and down, or in a circular motion. Nystagmus is often accompanied by vision problems, including blurriness.
Blindness is the inability to see anything, including light. It can be partial or complete, and can be caused by a number of different diseases, or be present at birth.
Photophobia, or light sensitivity, is when bright lights hurt your eyes. It can be associated with a number of conditions, ranging from minor to very serious.